He completed both his Cardiology and Electrophysiology Fellowships at the Brown University School of Medicine/Rhode Island Hospital.

Dr. Koo received faculty appointments as Instructor in Medicine at Harvard Medical School and Assistant Professor of Medicine at the Brown University School of Medicine. He was the Co-Director of the Atrial Fibrillation Ablation Laboratory at Rhode Island Hospital.

He is a member of The American College of Cardiologists and The Heart Rhythm Society. Dr. Koo's interests include Ablation for Atrial Fibrillation, Cardiac Defibrillators, Pacemakers, SVT, Ventricular Tachycardia, Syncope and Sudden Cardiac Death. He has published articles in the Journal of Cardiac Electrophysiology, the Journal of Interventional Cardiac Electrophysiology and was an Oral Abstract Presenter at EuroPace 2007. Dr. Koo presented his research at the 2008 and the 2012 Heart Rhythm Society Scientific Sessions.

Dr Koo is a Cardiac Electrophysiology manuscript reviewer for the American Journal of Cardiology and is a Cardiovascular Research Steering Committee Co-Chair at Jersey Shore University Medical Center. He has been a active participant in a number of scientific trials including the CareFlow, Housecalls Plus, Provide, BradyCare, and Rate Trials.